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A small word of caution when milling any boards. Depending on the species and how it was dried there can be a lot of internal stresses built up between fibers. So even if you mill a perfectly square and planar board, changes in moisture, or the next step in the process like cutting, can relieve those stresses and you end up with a newly twisted board. Pay attention to grain and ensure your boards are acclimated to the conditions in which they will be put in service.I also remember seeing in fine woodworking some time ago the trick of dropping a board from about 4 feet up. Internal stresses can be relieved to some degree with this method, prior to trueing up your piece.